Mavvan Conflict
From Wookieepedia, the Star Wars wiki.
The Mavvan Conflict was fought between the Galactic Empire against an early Rebel group sometime prior to 15 BBY. During the conflict, the Empire released the toxic Rooze germ, a heavy handed move that devastated the Imperial forces as well as the Rebels.
Most likely because they were immune to the germ, the Kobok became involved in the battles. Their earlier skirmishes against the Corporate Alliance prepared the insectoids for this new war. The Koboth Insurgent Mantle was an award given to Koboks who had served with distinction during the conflict.
